1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//===--- MetadataVisitor.h - CRTP for metadata layout -----------*- C++ -*-===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// A CRTP helper class for preparing the common metadata of all metadata
// objects.
//
//===----------------------------------------------------------------------===//
#ifndef SWIFT_IRGEN_METADATAVISITOR_H
#define SWIFT_IRGEN_METADATAVISITOR_H
namespace swift {
namespace irgen {
/// A CRTP class for laying out a type metadata's common fields. Note that this
/// does *not* handle the metadata template stuff.
template <class Impl> class MetadataVisitor {
protected:
Impl &asImpl() { return *static_cast<Impl*>(this); }
IRGenModule &IGM;
MetadataVisitor(IRGenModule &IGM) : IGM(IGM) {}
public:
void layout() {
// Common fields.
asImpl().addValueWitnessTable();
asImpl().noteAddressPoint();
asImpl().addMetadataFlags();
}
/// This is the address point.
void noteAddressPoint() {}
};
} // end namespace irgen
} // end namespace swift
#endif
|
